Background Findings are mixed on the relationship between attention-deficit hyperactivity
disorder (ADHD) and younger relative age in the school year. We aimed to investigate …

Background The youngest children in a school class are more likely than the oldest to be
diagnosed with ADHD, but this relative age effect is less frequent in older than in younger …

Background Previous studies from North America and Iceland have shown that the youngest
children within a grade are up to twice as likely to be diagnosed and treated for attention …

A number of worldwide studies have demonstrated that children born later in the school year
are more likely to receive an ADHD diagnosis than their same school-year peers. There is …

There is a growing international literature investigating the relationship between attention-
deficit/hyperactivity disorder (ADHD) and younger relative age within the school year, but …

Objective To investigate the effect of relatively younger age on attention-deficit/hyperactivity
disorder (ADHD) symptoms and diagnosis through three population-based cohorts and a …

Assessing whether symptoms of attention-deficit hyperactivity disorder (ADHD) in children
are age-inappropriate is essential. Hence, comparing children within one school grade is …

BACKGROUND: Multiple studies have found that the youngest children in a classroom are
at elevated risk of being diagnosed with, or medicated for, ADHD. This systematic review …

Background: Studies from several countries have reported that children youngest in grade
are at higher risk of attention-deficit/hyperactivity disorder (ADHD) diagnosis and treatment …

Objective An increasing number of studies has shown an association between parental age
and psychiatric disorders. However, there are inconsistent results regarding whether age at …